better than fox body for the body, better interior, and better suspension geometry. cost all depends on what u can find. you can find a cheap one that was beat, or buy one with a few good mods and good condition for more. in other words you get what u pay for. I got mine all done for 10 grand, but you can get them for like 5k now. start saving, it'll pay off later trust me.
It all depents on what you can find. Right now in my area you can find one with anywhere from 90 to 120 thousand miles ranging from 5 to 7 thousand dollars. When I bought mine I paid 6 grand and it had 104,000 miles. At the time that was the only stang I could find that was in my price range and what I wanted.